## Square ends for cylinder in a box. 250 Cylinder Challenge.

##### 3:19 PM, Tuesday June 29th 2021

Anyone got any tips for how to ensure or check that the ends of the box are square and not rectangle/rhombus etc? I'm struggling, perhaps I should know but I can't find answers to the problem.

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##### 10:53 AM, Wednesday June 30th 2021

That's actually the purpose of the exercise. To draw boxes, then to use the ellipse on either end of the cylinder to test how far off the two opposite ends were from being proportionally square.

Based on that analysis, and whether or not the ellipses' own 3 line extensions converge towards the box:s vanishing points, we can test our results. Just like when we extend the box challenges' edges to improve our ability to draw edges with consistent convergences, here it helps us improve our ability to instinctually estimate the proportions of the boxes we draw.

##### 1:25 PM, Wednesday June 30th 2021

Thanks for the reply. I just thought there may be some tricks when constructing the box that could help the chances of getting an accurate result. It is taking me a spectacularly long time to try for just one cylinder in a box.

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### Wescott Grid Ruler

Every now and then I'll get someone asking me about which ruler I use in my videos. It's this Wescott grid ruler that I picked up ages ago. While having a transparent grid is useful for figuring out spacing and perpendicularity, it ultimately not something that you can't achieve with any old ruler (or a piece of paper you've folded into a hard edge). Might require a little more attention, a little more focus, but you don't need a fancy tool for this.

But hey, if you want one, who am I to stop you?