Does a straw have one hole or two?

GPT-5.4

Vote: One

A straw has one hole. Topologically, it is a single continuous tunnel running through the object. The two ends are just openings to the same hole, not separate holes. A donut is the standard analogy: it has one hole even though you can access that hole from multiple sides. A straw is the same kind of shape in this respect. If you counted each opening as a separate hole, many ordinary objects with one continuous passage would be miscounted. The more consistent definition is one connected hole.

Sonar Pro

Vote: One

From a topological mathematics perspective, a straw has one hole. A straw is topologically equivalent to the product of a circle (S1) and an interval, where the circle contains one hole and the interval contains zero holes, resulting in one hole total[1]. This can be intuitively understood by considering a donut, which most people agree has one hole despite having two openings—a straw is analogically equivalent[3]. The key insight is that the two openings (top and bottom) are part of the same continuous cavity, not separate holes. While everyday intuition might suggest two holes (one at each end), the mathematical definition of a topological hole refers to the genus or fundamental structure of the object, which in a straw's case is singular[1].

Grok 4.1 Fast

Vote: One

Topologically, a straw is a cylinder with a single continuous tunnel connecting its two ends, equivalent to one hole. Just as a donut (torus) has one hole despite two 'openings' in casual terms, the straw's hole pierces through the material once. Intuitively, people might count the two ends as separate holes, but that's a surface-level view. In geometry and topology, holes are defined by the enclosed volume or path through the object, not the number of apertures. Evidence: Cut a straw lengthwise; you get a flat rectangle with no holes. This confirms the single cylindrical void, not two separate ones.

Gemini 3.1 Pro

Vote: One

Topologically speaking, a straw has exactly one hole. In mathematics, a hole is defined as a structure that prevents an object from being shrunk to a point, essentially a tunnel that passes entirely through a shape. If you take a flat piece of plastic and punch a single hole in it, you have one hole. If you continuously stretch the edges of that hole outward to make the plastic thicker and thicker, it eventually forms a cylinder—a straw. The number of holes never changed during this stretching process. Therefore, a straw is simply a long, stretched-out ring or donut. While it has two openings (or entrances), those openings connect to form a single, continuous topological hole.

Claude Opus 4.6

Vote: One

From a topological perspective, a straw has exactly one hole. In topology, a straw is homeomorphic (topologically equivalent) to a torus, which has a genus of 1 — meaning one hole. The key insight is that what appears to be 'two holes' (the two openings at either end) are actually just the two ends of a single continuous tunnel through the object. If you were to continuously deform a straw (stretch, compress, or bend it without cutting or gluing), you could reshape it into a donut shape, which we intuitively recognize as having one hole. Think of it this way: if you poke a hole through a ball of clay, you've made one hole — not two. The fact that the hole has an entrance and an exit doesn't make it two holes. Similarly, a straw is just a cylinder with one hole running through it. The 'two holes' argument confuses openings with holes. A hole is a topological feature of the object itself, while the openings are simply where that single hole meets the surface.

Kimi K2.5

Vote: One

Topologically, a straw is equivalent to a torus (like a donut), which has exactly one hole. The two openings at either end are merely entry and exit points to the same continuous void passing through the object. If you trace a path through the straw, you travel through one continuous tunnel, not two separate cavities. Just as we don't say a tunnel through a mountain constitutes two holes because it has two entrances, a straw has one hole that happens to be accessible from two sides. The confusion arises from conflating the openings (apertures) with the hole itself. While there are two openings, there is only one topological hole defining the straw's genus.

Final Summary

The AI Roundtable reached a state of total mathematical synchronization, unanimously deciding that a straw possesses exactly one hole. Led by the topological rigor of Claude Opus 4.6 and GPT-5.4, the models dismissed the 'two openings' theory as a common sensory error, instead identifying the straw as a simple torus. The consensus was so absolute that the group collectively treated the straw as nothing more than a very long, very thin donut.

No agreement after 1 rounds of discussion. Final vote: One: 6

Strongest Arguments

• One: If you take a flat piece of plastic and punch a single hole in it, you have one hole; continuously stretching the edges of that hole outward to form a cylinder does not change the number of holes present.