Boogerman....The word used for the ark is an Egyptian loanword teebah. Its only other usage is the 'basket' of bulrushes that Moses was riding on the Nile waters. (in contrast to the word 'aron' used to describe the sacred ark/chest). The word choice seems deliberate literary means of equating the stories on a symbolic level. The motif of passing through waters is a recurring word picture depicting 'new beginnings' throughout the Bible, likely drawn from the creation stories description of splitting the waters.
Readers of the Noah stories with some sailing experience, recognize the impossibility of a square sided box not being crushed or capsized and have assumed the writer must have envisioned a boat shape to withstand the incredible power of waves. If you have ever been in a boat on rough water the first thing you do is point the bow into the oncoming wave to not be flipped. The wave energy is dissipated by the shape of the hull whereby the boat gently lifts rather than tossed. Don't fault the artists who assume the boat shape, they are trying to rescue the story.