Passage 5.21.17
ὡς δὲ ἐγεγόνει τὰ πραχθέντα ἔκπυστα, ἐπιβάλλουσιν οἱ Ἑλλανοδίκαι ζημίαν, ἐπιβάλλουσι δὲ οὐ τοῖς παισίν, ἀλλὰ ἐς τοὺς πατέρας ἔτρεψαν τὴν ὀργήν· οὗτοι γὰρ δὴ καὶ ἠδίκουν. ἀπὸ ταύτης τῆς ζημίας ἀγάλματα ἐποιήθη· καὶ τὸ μὲν ἐν τῷ Ἠλείων ἀνάκειται γυμνασίῳ, τὸ δὲ τῆς Ἄλτεως πρὸ τῆς Ποικίλης στοᾶς καλουμένης, ὅτι ἦσαν ἐπὶ τῶν τοίχων γραφαὶ τὸ ἀρχαῖον. εἰσὶ δʼ οἳ τὴν στοὰν ταύτην καὶ Ἠχοῦς ὀνομάζουσι· βοήσαντι δὲ ἀνδρὶ ἑπτάκις ὑπὸ τῆς ἠχοῦς ἡ φωνή, τὰ δὲ καὶ ἐπὶ πλέον ἔτι ἀποδίδοται.
When the actions became known, the Hellanodikai imposed a penalty, not upon the boys themselves, but they turned their anger upon their fathers, who were indeed responsible for the wrongdoing. From this fine, statues were made; one of these stands in the gymnasium of the Eleans, and the other is set up in the Altis, before the colonnade called Painted (Poikile), because in ancient times there were paintings on its walls. However, there are also some who call this colonnade the "Echo." For if a man shouts aloud, his voice is repeated seven times by the echo, and sometimes even more frequently.